Alonso is really looking like he could be a future contributor. That said, even if NYM go to full rebuild this year, I do not think you see him up in the bigs. In a rebuild, you would want them to wait until Super 2 next year. In the meantime, let D. Smith sink or swim at the MLB level, while Alonso keeps developing, probably at AAA once Smith is up.
"Always look on the bright side of life!"
Eric Idle